Xeroderma pigmentosum group D patient bearing lentigo maligna without neurological symptoms.

A 35-year-old Japanese female patient with xeroderma pigmentosum (XP), registered as XP114TO, was assigned to complementation group D by the cell fusion complementation test. The patient had manifested moderate solar sensitivity and freckles by the age of 6 years. The skin phototest using 290- and 300-nm monochromatic ultraviolet (UV) light revealed slightly lowered minimal erythema doses at 24 h after irradiation. The XP114TO skin fibroblasts exhibited about the 6-fold higher sensitivity to the lethal effect of 254-nm UV as did normal cells. Unscheduled DNA synthesis (UDS) induced in XP114TO cells by 254-nm UV (10 J/m2) was 33% of normal, falling into the group D range of 25-50% UDS. The patient developed lentigo maligna on the right side of the nose. Unlike the typical XP group D cases in the West, she showed no neurological abnormalities.